5.2.26 777Error
Error conditions and Check Items
Is the factory jumper
installed properly on
CN24?
Is the LWCO installed
properly?
Is the output voltage
normal on CN25?
(AC 24V)
Is proper power being
supplied to the LWCO?
Replace the main PCBCheck LWCO
Check the factory
installed jumper
and jumper
connection (CN24)
Check the
connecting
terminals
(CN25)
NoNo
Yes
No
Yes
Yes
Yes
Check method
Fault Possible Causes Check method
E777
Abnormal factory
installed jumper
1. Check the factory installed jumper and jumper connection.
2. Check the output voltage normal.
Check the output voltage ( Normal voltage : AC 24V)
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